Truing device for fruit jar covers



H. s. LUBBEN TRUING DEVICE FOR` FRUIT JAR COVERS Filed May 29, 1935 Il rMay 4, 1937.

Patented May 4, 1937 Parar fr oFFlcE 1 Claim.

vlll/ly invention relates toa device for correctly reshaping and'truingfruit jar covers.

Anl object of my invention is' to provide suchl a'A device which willaccurately and positively reshape the lower flange of a jar cover"sothat it will seat accurately upon the rubber gasket.

A further object of my invention is toprovide such a device whichwillcause a positive, accurate centering thereon so that the truingoperation le will be accurate within very close clearances.

A further object of my invention is to provide means for truing thethreads of the jar cover in connection` therewith.

A further object of my invention is to provide l5 means for causingpressure to be applied directly against the flange and to retain the jarcover in locked position during this operation. l

A further object of my invention is to provid the above mentioned meansin a construction of great simplicity which can be manufactured at avery reasonable cost.

With these and otherI objects in View, my invention consists in theconstruction, arrangement and combination of the various parts of my g5device, whereby the objects contemplated are attained, as hereinaftermore fully set. forth, pointed out in my claim, and illustrated in theaccompanying drawing, in which:

Figure l is a plan View of the device, 30 Figure 2 is a sectional viewtaken generally medially thereof, and

Figure 3 is an enlarged detail of apart thereof. In using jar covers,the lower seating flange of the jar covers usually always become bent ordis- ?.5 torted to a certain extent due to unequal pressures beingexerted or by being damaged during the normal handling of the same. As aresult when such a cover is used against its gasket, the jar will not besealed properly due to the unequal 4Q pressure, and there will be atendency for the rubber gasket to be squeezed at the particular locationof the raised portion of the flange. It is, therefore, necessary toprovide a truing device which will reshape this ange so that when 45 thejar cover is screwed on against the rubber gasket, the pressure willgrip the gasket practically simultaneously so that this effect will notoccur.

Furthermore, since the jar cover rim is very 50 small in breadth, it isnecessary to provide accurate centering means so that the flange will begripped positively at all points.

The base member is indicated generally by the character I0, and includesthe raised boss I I hav- 55 ing the cylindrical cavity I2. The boss IIis also cylindrical, and includes the accurately formed sides I3.Merging with the sides I3, is the 'beveled portionV Ill which terminatesin the portion I5 which includesmale threads I6 adapted to conformclosely to the threads in a standard fruit jar cover. It will beunderstood that the base member IU canrbe formed integrally' as shown orin any other suitable Way, although the preferred form, as shown, showsthe form having the integral features of a single casting, preferablymade of aluminium or other metal. The base can also be hollow as shownand having the side Walls I'I which act as ribs for the structure tostrengthen the same.

The usual jar cover I8 which includes the porcelain or glass insert I9is screwed down tightly on the threads I6 so that the small flange 20 ofthe jar cover will rest against the beveled shoulder I4. The top member2| is then placed downwardly over the jar cover. This member includesthe cylindrical handle 22, the strength- -ening ribs 23, the lowerannular member 24,

which merges with the beveled portion 25, the beveled portion 25 to beexactly parallel with the further beveled shoulders I d of the basemember. The member 24 terminates in the lower ring portion 26, which isclosely machined to fit the sides I3 with an extremely small clear-`ance therebetween. Figure 3 shows an` enlarged detail of this portion`of the device, showing the small clearance, which feature is animportant part of my invention.

In reshaping the flange 2l] of the jar cover I8, the device 2l, asstated, is placed over the cover and the handle 22 is firmly graspedwith the hand, and a firm and positive pressure is applied downwardlyagainst the base member, at the same time rotating the upper member 2ISince by virtue of the ring shaped member 26 the de.- vice will be veryclosely centered, the small flange 2U will be accurately reshaped, andall the indentations or raised portions will be merged into a uniformlevel surface. If the centering means were not provided this functioncould not occur due to the errors involved.

The member 24 includes the cylindrical walls 2'I which are ofpractically the same diameter as the threads in the jar cover. Thereason for this is that when the upper piece is forced downwardly thisportion will tend to straighten out threads which may have also becomedistorted through use, so that as a result the entire jar cover isreshaped accurately. 'Ihe positive, downwardly, and rotational pressureexerted by means of the upper piece against the lower piece results in apositive truing device which reshapes the flange and the jar cover sothat it will seat perfectly against the usual rubber gasket.

It will be observed further that the jar cover 5 by being screwed by thethreads to the lower member is held rigidly and can not be turned sincethe rotational pressure is exerted in the direction of the threads. Theharder the upper piece is turned, the more positive will become thelocking of the jar cover. This is necessary to secure a relativemovement between the pieces in order to eiect the best truing results.

It will now be seen that I have provided a truing device for jar coverswhich Will positively and exactly reshape the lower flange of a jarcover, which will provide accurate centering means for the same duringthis operation, which reshapes the entire jar cover ready for use, andwhich allows a convenient application of pressure directly above thework to be done.

It Will be seen further that I have provided all the above mentionedmeans in a structure of great simplicity which can be manufactured at avery reasonable cost.

Some changes may be made in the construction and arrangement of theparts of my invention without departing from the real spirit and purposeof my invention, and it is my intention to cover by my claim any modiedforms of structure or use of mechanical equivalents, which may bereasonably included within their scope. 5

I claim as my invention:

A fruit jar cover truing device comprising a cylindrical base memberincluding a beveled shoulder extending from said base member,continuation of said shoulder including threads 10 adapted to bereceived within the threads of a fruit jar cover and to cause the fruitjar ange to be seated upon said beveled shoulder, an upper rotatablemember having a further beveled shoulder adapted to firmly compress saidfruit 15 jarflange against the said base member shoulder, and said uppermember including an annular ring extension directly adjacent said secondmentioned beveled shoulder, the extension being adapted to closelyreceive the periphery 20 bounding said base member shoulder to provideaccurate centering means thereon, and said upper member including aApair of upstanding ribbed iianges, a cylindrical handle attachedbetween the flanges. 25

HENRY S. LUBBEN.

